Aërial Navigation: A Popular Treatise on the Growth of Air Craft and on Aëronautical MeteorologyZahm, Albert Francis
History
Aërial Navigation: A Popular Treatise on the Growth of Air Craft and on Aëronautical Meteorology
Zahm, Albert Francis
Aeronautics; Meteorology
He now sent the home folks away from the farm, buckled on his wings and
walked along the prairie road waiting for a breeze. The road was raised
five feet above the plain and bordered by ditches ten feet wide. His
wings felt light; he ran forward to test their lift, and he thought to
amuse himself by jumping the ditch. The result is thus expressed in his
own words:[25]
“So I took a good run across the road and jumped at the ditch.
But, oh, horrors; once across the ditch my feet did not come
down to earth; I was gliding on the air, and making vain
efforts to land; for my aëroplane had set out on a cruise. I
dangled only one foot from the soil, but, do what I would, I
could not reach it, and I was skimming along without the power
to stop. At last my feet touched the earth; I fell forward
on my hands; broke one of my wings, and all was over; but
goodness, how frightened I had been! I was saying to myself
that if even a light wind-gust occurred, it would toss me up
30 to 40 feet into the air, and then surely upset me backward,
so that I would fall on my back. This I knew perfectly, for I
understood the defects of my machine. I was poor, and I had not
been able to provide myself with a more complete aëroplane.
All’s well that ends well. I then measured the distance between
my toe marks, and found it to be 138 feet.
“Here is the rationale of the thing. In making my jump I
acquired a speed of 11 to 14 miles per hour, and just as I
crossed the ditch I must have met a puff of rising wind. It
probably was traveling some 8 to 11 miles per hour, and the
two speeds added together produced enough pressure to carry my
weight.”
He repaired his wing and repeated the test a few days later. A violent
wind gust came; picked him up from the earth, and whelmed him over. In
his alarm he allowed his “wish-bone” to spread, and the wings to fold
up like those of a butterfly at rest, pinching him between them like
a nut in a nutcracker. One wonders whether the overwheeling vultures
witnessed this gentleman’s flight with any sense of humor.
After mature reflection, Mouillard concluded that he should give his
aëroplane a rudder, and flex the wings, in order to insure adequate
control. But here he halted, being a poor man unskilled in the art
of construction. He had reached the limit of his endowments. He had
observed faithfully and described charmingly the wonderful flights
of various birds; but he must leave to his technical successors the
pleasure of imitating or excelling those extraordinary maneuvers—leave
them the pleasure, the sacrifice, the long years of toil and danger,
accompanied perhaps by indiscriminate applause or derision.
Public-domain text, read in full here on John Shaqi.
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